Resilient device

ABSTRACT

A urinary incontinence device includes a working portion having an insertion equivalent diameter ranging from about 10 to about 25 mm and a use equivalent diameter ranging from about 25 to about 35 mm under an expansion pressure of about 20 to about 150 cm H 2 O.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a resilient device. More specifically, this invention relates to a device that has a working portion having an insertion equivalent diameter and a use equivalent diameter ranging under a given expansion pressure. The device is useful, e.g., for reducing or preventing urinary incontinence.

Description of the Prior Art

Stress urinary incontinence is a problem for many women. It is characterized by leakage of urine during a stressing event, such as a cough or a sneeze. Many devices have been designed to reduce or prevent stress urinary incontinence. U.S. Pat. No. 5,603,685 teaches inflatable devices and a means to provide a device that is small for insertion into the vagina and enlarges to a required shape and pressure to reduce or prevent urinary incontinence. U.S. Pat. No. 6,090,098 teaches tampon-like devices, each made with a combination of absorbing and/or non-absorbing fibrous materials. U.S. Pat. No. 6,645,137 teaches a coil that expands in the vagina. U.S. Pat. No. 5,036,867 teaches a compressible resilient pessary. U.S. Pat. No. 6,460,542 teaches a highly shaped rigid pessary. Many patents are drawn to stents that are sized and designed to keep arteries open.

Despite the teaching of the prior art, there is a continuing need for a device suitable for insertion into a vagina and useful for reducing or preventing urinary incontinence.

SUMMARY OF THE INVENTION

This need can be met by the present invention, which provides an intravaginal urinary incontinence device including a working portion having an insertion equivalent diameter ranging from about 10 to about 25 mm, and a use equivalent diameter ranging from about 25 to about 35 mm under an expansion pressure of about 20 to about 75 cm H₂O. The working portion may be an elastic stent, preferably formed of a shape memory polymer or a metal alloy. The device may also include an anchoring portion having at least one member extending beyond at least one end of the working portion.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a device according to the present invention;

FIG. 2 is a perspective view of the device of FIG. 1 in the insertion state.

FIG. 3 is a perspective view of the device of FIG. 1 in the use state.

FIG. 4 is a perspective view of a second device according to the present invention;

FIG. 5 is a front plan view of three anchoring portion shapes useful in the present invention;

FIG. 6 is a perspective view of another device according to the present invention;

FIG. 7 is a side view of the device of FIG. 1;

FIG. 8 is a device in a bag that is useful for the present invention;

FIG. 9 is a tool utilized to form the devices utilized in the present invention;

FIG. 10 is a tool utilized to heat treat the devices utilized in the present invention;

FIG. 11 is a force vs extension curve;

FIG. 12 is a diameter vs pressure curve; and

FIG. 13 is a graph of the diameter versus pressure of the device using the linear scale method.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Referring to FIGS. 1-7, there is shown a device 10 according to the present invention. As shown in FIGS. 1 and 7, device 10 has a working portion 1 which is generally cylindrical in shape and has faces 9 a and 9 b to provide support to an associated urinary system. Working portion 1 has an initial equivalent diameter d ranging from about 20 mm to about 170 mm and a length L1 ranging from about 15 mm to about 60 mm. Where the working portion is non-cylindrical, the equivalent diameter is the maximum distance in millimeters between the faces. As seen in FIG. 2, working portion 1 has an insertion (in an applicator or other device for insertion) equivalent diameter d2 ranging from about 5 mm to about 20 mm. As seen in FIG. 3, working portion 1 has a use equivalent diameter (in the vagina) d3 ranging from about 5 mm to about 40 mm. Working portion 1 may be made of any elastic material that compresses and recovers with sufficient force to provide the desired effect. In one embodiment, the working portion 1 is made of Nitinol wire and comprises alternating sinusoidal struts 2, 3 which intersect and form a strut angle θ. Alternating struts 2, 3 have a length L2 and L3 equal to the working portion length. The working pressure exerted by working portion 1 is determined by the thickness of the wire, the number of wires, the length of the struts and the strut angle, and the number of times the working portion is heat treated. The number of wires may range from about 1 to about 20. The wires may be separate, twisted, or braided. For some applications, the working portion exerts a pressure of from 5 to 250 cm H₂O in the working state. Device 10 may also have an anchoring portion 4. Anchoring portion 4 is designed to keep the device in place when in use. Anchoring portion 4 is shaped suitable to keep the device in place while in use. Suitable shapes include, but are not limited to, a basket handle 5, a dog bone 6, and rabbit ears 7, as shown in FIG. 5. The anchoring portion may be made of the same material as the working portion or they may be made of different materials. The working portion and anchoring portion may be made as a uni-body construction, or may be made separately and joined by attachment means, such as silicone tubing. The devices may be treated to provide improved biocompatibility. The device may be placed inside tubing, for example silicone tubing, or may be dip coated in suitable polymeric materials to improve biocompatibility.

As used herein the specification and the claims, the term “wire form” and variants thereof relate to a structure formed of at least one wire or wire-like material that is manipulated and optionally secured (e.g., by welding) in a desired three-dimensional structure.

As used herein the specification and the claims, the term “shape memory material” and variants thereof relate to materials that can be shaped into an initial shape, which initial shape can be subsequently formed into a stable second shape. The material is capable of substantially reverting to its initial shape upon exposure to an appropriate event, including without limitation mechanical deformation and a change in temperature.

As used herein the specification and the claims, the term “stent” and variants thereof relate to a device used to support a bodily orifice, cavity, vessel, and the like. The stent is resilient, flexible, and collapsible with memory. The stent may be any suitable form, including, but not limited to, scaffolding, a slotted tube or a wire form.

Devices according to the present invention may be useful for treating or preventing urinary incontinence. For this application, the device is sized to fit comfortably in the vagina. All of the devices described below may have working portions with initial equivalent diameters of from about 20 to about 170 mm. Preferably, the working portion has a generally cylindrical working portion that may have an initial equivalent diameter ranging from about 20 to about 170 mm, preferably about 20 to about 45 mm, or more preferably about 30 mm; an insertion equivalent diameter ranging from about 5 to about 25 mm, preferably about 10 to about 20 mm, or more preferably about 18 mm; a use equivalent diameter ranging from about 20 to about 40 mm, preferably about 25 to about 30 mm, or more preferably about 25 mm; and a length ranging from about 20 to about 60 mm, preferably about 20 to about 30 mm, or more preferably about 25 mm. The anchoring portion extends beyond the working portion and may have an initial equivalent diameter ranging from about 20 to about 60 mm, preferably about 40 to about 60 mm, or more preferably about 50 mm; an insertion equivalent diameter ranging from about 10 to about 25 mm, preferably about 10 to about 20 mm, or more preferably about 18 mm; a use equivalent diameter ranging from about 20 to about 60 mm, preferably about 40 to about 60 mm, or more preferably about 50 mm; and a length ranging from about 10 to about 50 mm, preferably about 20 to about 40 mm, or more preferably about 30 mm.

For a basket stent (having a basket handle-shaped anchoring portion as shown in FIG. 6), the working portion of the device has a length and equivalent diameter in the insertion state, the working state, and the removal state. The insertion state length may range from about 20 to about 30 mm, for example about 25 mm. The insertion state equivalent diameter may range from about 5 to about 20 mm, for example about 18 mm. The working state length at rest and during a cough may range from about 20 to about 30 mm, for example about 25 mm. The working state equivalent diameter at rest may range from about 20 to about 30 mm, for example about 25 mm. The working state equivalent diameter during a cough may range from about 15 to about 25 mm, for example about 20 mm. The removal state length may range from about 20 to about 30 mm, for example about 25 mm. The removal state equivalent diameter may range from about 15 to about 20 mm, for example about 18 mm.

The anchoring portion of the device has a length and width in the insertion state, the working state, and the removal state. The insertion state length may range from about 25 to about 40 mm, for example about 30 mm. The insertion state width may range from about 15 to about 20 mm, for example about 18 mm. The working state length at rest and during a cough may range from about 25 to about 40 mm, for example about 30 mm. The working state width at rest and during a cough may range from about 25 to about 35 mm, for example about 30 mm. The removal state length may range from about 30 to about 50 mm, for example about 40 mm. The removal state width may range from about 15 to about 20 mm, for example about 18 mm.

For a straight stent, the working portion of the device has a length and equivalent diameter in the insertion state, the working state, and the removal state. The insertion state length may range from about 25 to about 60 mm, for example about 45 mm. The insertion state equivalent diameter may range from about 5 to about 20 mm, for example about 18 mm. The working state length at rest and during a cough may range from about 25 to about 60 mm, for example about 45 mm. The working state equivalent diameter at rest may range from about 20 to about 30 mm, for example about 25 mm. The working state equivalent diameter during a cough may range from about 15 to about 25 mm, for example about 20 mm. The removal state length may range from about 25 to about 60 mm, for example about 45 mm. The removal state equivalent diameter may range from about 15 to about 20 mm, for example about 18 mm.

For a rabbit stent (having a “rabbit ear”-shaped anchoring portion, as shown in FIGS. 1, 3, and 7), the working portion of the device has a length and equivalent diameter in the insertion state, the working state, and the removal state. The insertion state length may range from about 20 to about 30 mm, for example about 25 mm. The insertion state equivalent diameter may range from about 10 to about 20 mm, for example about 15 mm. The working state length at rest and during a cough may range from about 20 to about 30 mm, for example about 25 mm. The working state equivalent diameter at rest and during a cough may range from about 10 to about 30 mm, for example about 18 mm. The removal state length may range from about 20 to about 30 mm, for example about 25 mm. The removal state equivalent diameter may range from about 10 to about 20 mm, for example about 15 mm. The height of the working portion in all states may range from about 20 to about 30 mm, for example about 25 mm.

The anchoring portion of the device has a length and width in the insertion state, the working state, and the removal state. The insertion state length may range from about 20 to about 50 mm, for example about 30 mm. The insertion width may range from about 10 to about 20 mm, for example about 18 mm. The working state length at rest and during a cough may range from about 20 to about 50 mm, for example about 30 mm. The working state width at rest and during a cough may range from about 20 to about 60 mm, for example about 50 mm at the top and from about 10 to about 50 mm, for example about 25 mm at the bottom. The removal state length may range from about 20 to about 50 mm, for example about 30 mm. The removal state width may range from about 10 to about 20 mm, for example about 18 mm.

For a flower stent (shown in FIG. 4), the working portion of the device has a length and equivalent diameter in the insertion state, the working state, and the removal state. The insertion state length may range from about 20 to about 30 mm, for example about 25 mm. The insertion state equivalent diameter may range from about 10 to about 20 mm, for example about 15 mm. The working state length at rest and during a cough may range from about 20 to about 30 mm, for example about 25 mm. The working state equivalent diameter at rest may range from about 20 to about 35 mm, for example about 25 mm. The working state equivalent diameter during a cough may range from about 15 to about 30 mm, for example about 20 mm. The removal state length may range from about 20 to about 30 mm, for example about 25 mm. The removal state equivalent diameter may range from about 10 to about 20 mm, for example about 15 mm.

The anchoring portion of the device has a length (L_(A)) and width (W_(A)) in the insertion state, the working state, and the removal state. The insertion state length may range from about 20 to about 50 mm, for example about 30 mm. The insertion width may range from about 10 to about 20 mm, for example about 18 mm. The working state length at rest and during a cough may range from about 20 to about 60 mm, for example about 30 mm. The working state width at rest and during a cough may range from about 20 to about 60 mm, for example about 30 mm at the top and from about 10 to about 50 mm, for example about 20 mm at the bottom. The removal state length may range from about 20 to about 60 mm, for example about 30 mm. The removal state width may range from about 10 to about 20 mm, for example about 18 mm.

Elements of the devices of the present invention may be made from any elastic or supereleastic material. Suitable materials include, but are not limited to D metal alloys, for example a nickel-titanium (“NiTi”) alloy known in the art as Nitinol. As is known in the art, there are a variety of ways to process NiTi, including resistance heating and permanent deformation to create a shape set. Other materials (other alloys, superelastic alloys or other NiTi compositions) may be utilized to make devices according to the present invention.

Shape memory is the ability of a material to remember its original shape, either after mechanical deformation, which is a one-way effect, or by cooling and heating which is a two-way effect. This phenomenon is based on a structural phase transformation. The first materials to have these properties were shape memory metal alloys including NiTi (Nitinol), CuZnAl, and FeNiAl alloys. Examples of suitable alloys further include Algiloy, Stainless Steel, for example 304 stainless steel, and carbon spring steels. The structure phase transformation of these materials is known as martensitic transformation.

Shape memory polymers (SMPs) are light, high in shape memory recovery ability, easy to manipulate and process, and economical compared to shape memory alloys. These materials are also useful for devices according to the present invention. There are few ways to achieve the shape memory properties. SMPs are characterized as phase segregated linear block co-polymers (e.g., thermoplastic elastomers) having a hard segment and soft segment that form physical cross-links. The hard segment is typically crystalline with a defined melting point, and the soft segment is typically amorphous with a defined glass transition temperature. The transition temperature of the soft segment is substantially less than the transition temperature of the hard segment. Examples of these materials include polyurethanes; polyether amides; polyether ester; polyester urethanes; polyether urethanes; and polyurethane/urea. SMPs are also formed by covalently cross-linked irreversible formation of the permanent shape. Different parameters that can be tailored for these materials are mechanical properties of permanent and temporary shape, customized thermal transitions, and kinetics of shape memory effect. SMPs can be biostable and bioabsorbable. Biostable SMPs are generally polyurethanes, polyethers, polyacrylates, polyamides, polysiloxanes, and their copolymers. Bioabsorbable SMPs are relatively new and include thermoplastic and thermoset materials. Shape memory thermosets may include poly (caprolactone) dimethyacrylates; and shape memory thermoplastics may include combinations of different monomers to prepare polyester based copolymers.

When the SMP is heated above the melting point of the hard segment, the material can be shaped. This “original” shape can be memorized by cooling the SMP below the melting point of the hard segment. When the shaped SMP is cooled below the glass transition temperature of the soft segment while the shape is deformed, a new “temporary” shape is fixed. The original shape is recovered by heating the material above the glass transition temperature of the soft segment but below the melting point of the hard segment. The recovery of the original shape induced by an increase of temperature is called the thermal shape memory effect. Several physical properties of SMPs other than ability to memorize shape are significantly altered in response to external changes in temperature and stress, particularly at the glass transition of the soft segment. These properties include elastic modulus, hardness, and flexibility. The modulus of SMP can change by a factor of up to 200 when heated above the glass transition temperature of the soft segment. In order to prepare devices that will have sufficient stiffness, it is necessary to have thermal transitions such that the material will have high modulus at use temperature. For example, if a device is going to be used at body temperature, then the transition temperature may be higher than 37° C. (example 45-50° C.) so that upon cooling to 37° C. the modulus is high and thereby providing sufficient stiffness. It is also important to design the device such that it will compensate for lower physical properties compared to shape memory metal alloys. Some of the design features may include higher wall thickness; short connectors; or hinge points at appropriate locations. These materials can overcome some of the limitations with viscoelastic polymer properties such as creep and stress relaxation.

SMP can also be prepared by using TPEs prepared from hydrophilic polymers so that the phase transition can be also occur by physical changes due to moisture absorption. Examples of these TPEs are hydrophilic polymer ester amide (Pebax) and hydrophilic polyurethanes prepared by Elf Atochem and CardioTec International, respectively. Devices prepared from these materials will be soft and will be easier to remove after its use.

The shape memory materials may be formed of or at least enclosed within biocompatible materials, preferably materials that are approved for use in the human body. For example, medical grade silicone rubber may enclose a wireform device. This may be achieved through one or more tubular sheaths about the wire or as a coating prepared on the wire.

As shown in FIG. 8, the intravaginal devices also may be enclosed in a flexible bag or cover that may reduce friction during deployment, shield a wire form from view (to be aesthetically pleasing), help control the device during insertion and removal, help the device to stay in place, contain absorbent fibers of a tampon, contain a suppository substance, and/or create more contact area for applying pressure to the bladder neck. The cover may also provide increased friction against the vaginal epithelium in comparison to a silicone-coated wire form to reduce the likelihood of undesired movement during use, e.g., becoming skewed. Any medically appropriate materials may be used to form the bag, and depending upon the desired end-use, it may be opaque, light, and/or breathable. Useful bag materials include those used in the manufacture of tampons, such as nonwoven fabrics and plastic film, including apertured films. The bag itself may also be apertured.

The device preferably includes a withdrawal element such as a removal string. This may be crisscrossed between the struts of the device to create a “cinch sac” mechanism. Any string or cord known in the sanitary protection art may be useful for this purpose. As the strings are pulled during removal, the struts are gathered together to create a smaller diameter device during removal. Cinching the device at its base may make removal of the device more comfortable and easier as it makes the diameter of the device smaller and the shape conducive to remove easily.

The device may be contained within an applicator similar to those known for use in delivering tampons and suppositories. The applicator may be a push-type applicator or a retractable applicator. A collar may be added to control the depth of insertion.

EXAMPLES

The following examples are illustrative of devices according to the present invention. The claims should not be construed to be limited to the details thereof.

Prototype devices were modeled in shape and scale after existing, predicate vaginal pessary devices. There were two geometries presented for this device. The expanded stent device was approximately 35 mm in diameter and 55 mm long. The first of the proposed geometries was a simple S-shaped stent like a ring; the second resembled the form of a handled basket and was modeled in the form of the classic “ring” pessary. In its design the “basket” portion was approximately 25 mm high and the “handle” made up the balance of the overall length.

Both are assemblies of four known medical materials. The collapsed vaginal stents were enclosed in a commercial plastic tampon applicator. The working assemblies were made up of a nickel-titanium wire form (Nitinol), which was covered by a medical grade silicone rubber (silastic) tube. This covered wire form “stent” was placed in a heat-sealed bag made of the same standard non-woven polypropylene material used in tampon covers. This covered device was made to be easily removable by the addition of a tampon cotton string, as a cinch and removal pull.

The nickel-titanium wire used in these prototypes was the same alloy as used in vascular systems. Post-shape-setting processing of the metal does not effect corrosion and biocompatibility of the device. The silicone tubing was also a known medical grade material. The silastic tubing was Dow Q7-4750.

The general procedure was to shape an SE508 NiTi into the design on a form using one or multiple steps heating the fixture and from to about 500° C. for at least one minute for each step. Any excess wire was cut from the form. As is known in the art, the wire may be chemically etched to provide further biocompatibility. The wire was enclosed in a rubbery polymer coating such as silicone assuring to fasten the wire ends such that they may not puncture the surface.

Example 1—Rabbit Flat Pessary

Approximately 1 foot of straightened and etched SE508 wire, 0.0315″ diameter was obtained. The tool pictured in FIG. 9 was made using conventional techniques known in stent art. In a smooth upswing, the wire was wrapped around the pins in the following order to create the pattern: P7, P3, P1CC, P3, P6CC, P3, P6, P4, P8CC, P5, P8, P5, P2CC, P5, P7, P1CC, P3, P7 (the wrapping was clockwise, unless indicated by “CC”) The zigzag wrapping pattern was smoothly discontinued and the final end of the wire was poked through holes in the fixture to secure it. A large hose clamp was wrapped around the fixture, over the zigzag portion. The clamp was tightened to keep the wires in position, but not so much as to compress the wires to the surface of the fixture. The wound wire was heat treated on the fixture for 3 minutes in a 505C (calibrated) salt pot, then quenched with water. The heat treated wire was removed from the fixture by unwinding it. The wire was trimmed at point 3 allowing for overlap along the “ear” and the overlapping wires were wrapped to hold them together with NiCr wire. A secondary heat treatment fixture shown in FIG. 10 was made according to methods known in the art. The wire was aligned to form onto the fixture. The ends of the wire were ground to remove sham and Jagged edges.

The wire form component was passivated by methods known in the art to optimize biocompatibility. Some wire form components were etched or chemically processed to optimize biocompatibility. The parts were moved to a clean room and dipped in denatured alcohol before being placed on a clean table. All tools were cleaned with isopropyl alcohol as well as gloved hands before touching parts from denatured alcohol solution. Tubing was cleaned with Isopropyl alcohol by dripping through with a disposable pipette. The tube was dried by wicking onto a paper towel. The tube was filled with 2-4 inches of lubricant mineral oil from a syringe. Pressed fingers were run along the tube to spread the oil evenly along the inside. The tubing was slid over the wire carefully paying attention that the wire ends did not poke through the tubing. The tubing was pulled back to expose both wire ends. The ends were lined up so that the ear rests naturally. Forceps were used to hold the tubing back from the wire ends. Shrink tube was placed across the wire ends and heated to hold wire ends in place. The tubing was slid over the shrink tube section. Tubing ends were overlapped by at least ½ cm by pressing the ends together.

Example 2—Flower Flat Pessary

Approximately 1 foot of straightened and etched SE508 wire, 0.0315″ diameter was obtained. The tool pictured in FIG. 9 was made using conventional techniques known in stent art. In a smooth upswing, the wire was wrapped around the pins in the following order to create the pattern: P6, P3, P1CC, P3, P6, P4, P7, P5, P2CC, P5, P7, P4, P6, P3, P1CC, P3. The zigzag wrapping pattern was smoothly discontinued and the final end of the wire was poked through holes in the fixture to secure it. A large hose clamp was wrapped around the fixture, over the zigzag portion. The clamp was tightened to keep the wires in position, but not so much as to compress the wires to the surface of the fixture. The wound wire was heat treated on the fixture for 3 minutes in a 505C (calibrated) salt pot, then quenched with water. The heat treated wire was removed from the fixture by unwinding it. The wire was trimmed at point 3 allowing for overlap along the “ear” and the overlapping wires were wrapped to hold them together with NiCr wire. A secondary heat treatment fixture shown in FIG. 10 was made according to methods known in the art. The wire was aligned to form onto the fixture. The ends of the wire were ground to remove sharp and jagged edges. The wire form component was passivated by methods known in the art to optimize biocompatibility. Some wire form components were etched or chemically processed to optimize biocompatibility. The parts were moved to a clean room and dipped in denatured alcohol before being placed on a clean table. All tools were cleaned with isopropyl alcohol as well as gloved hands before touching parts from denatured alcohol solution. Tubing was cleaned with Isopropyl alcohol by dripping through with a disposable pipette. The tube was dried by wicking onto a paper towel. The tube was filled with 2-4 inches of lubricant mineral oil from a syringe. Pressed fingers were run along the tube to spread the oil evenly along the inside. The tubing was slid over the wire carefully paying attention that the wire ends did not poke through the tubing. The tubing was pulled back to expose both wire ends. The ends were lined up so that the ear rests naturally. Forceps were used to hold the tubing back from the wire ends. Shrink tube was placed across the wire ends and heated to hold wire ends in place. The tubing was slid over the shrink tube section. Tubing ends were overlapped by at least ½ cm by pressing the ends together.

Expansion Pressure Test

Rubber Band Methodology

The expansion pressure test was used to determine the outward pressure the device was able to exert as it expanded from its compressed insertion state to its deployed or use state in the body. Equilibrium of the expansion pressure and the internal resistance of the body determined the diameter of the device in place.

Sets of rubber bands in a range of sizes were needed. The bands utilized were the following sizes; orthodontic, #8, #10 and #12. Some sources of these rubber bands are Thomson Orthodontics of Prospect, Kentucky and Office Depot of Westhampton, N.J. A Chatillon TCD 200 benchtop tensile tester with a Chatillon DFIS 10 Digital Force Gauge was used to determine the force vs extension relation of the rubber bands. A small hook to secure the rubber bands was attached to the load bearing extension of the force gauge and a second hook was secured to the base of the tester directly below the first hook. The rubber bands were looped around these hooks for testing.

Each set type of rubber bands had at least 3 repeats of the following procedure done to determine the force vs extension relation. A band was held between the hooks and the crosshead was adjusted so that there was no tension on the band but the band had no slack in it. The distance between the two hooks was then measured and recorded as the zero force distance. This distance was actually one half the resting length of the rubber band. The crosshead was moved in increments of 5 to 10 mm at a speed of 12.5 mm/minute to stretch the rubber band. At each point the force was recorded. Provided the bands did not break, data was gathered up to about 70 mm crosshead displacement. Smaller size bands did not allow this much stretch. Average force level at each extension was averaged and a force vs extension curve for each band was plotted and is shown in FIG. 11.

Once the band force extension curves were obtained, the pressure vs expansion characteristics of the devices were determined. The operator chose a type of band to use. The operator compressed the device by hand and placed the rubber band around the device so that when the operator released the device to expand, it opened, the band stretched and the device and rubber band came to an equilibrium position. The band generally needed to be centered in the working section. For cylindrical working sections, the diameter of the band and device were measured and the perimeter was calculated as 3.14* diameter. This measured diameter is the equivalent diameter for a cylindrical stent. For rectangular designs, the perimeter of the band and the separation of the two faces were measured. For rectangular designs the separation of the two faces meant to reside adjacent to the anterior and posterior walls of the vagina are the equivalent diameter.

The perimeter value was divided by two and the force in the band was interpolated from the band force vs extension curve (example FIG. 11). For cylindrical working portions, expansion pressure was determined by dividing the force by the product of the equilibrium diameter and the axial length. For rectangular devices it was determined by dividing the force by the product of the product of the length times the width of the working portion.

The operator repeated the device testing procedure with a range of Band sizes so that a pressure vs size data points was obtained across the range of interest, ˜20 to 40 mm. In addition to using multiple sizes, multiple bands of the same size were used together to generate data points. In this case the force or pressure was multiplied by the number of bands used. A resulting diameter vs pressure curve for a device is shown in FIG. 12.

Linear Compressions Test Methodology:

The outward pressure the device exerts at various compression states (insertion to in-use to during stress) was measured using a simple linear scale (Mettler PK 4800 scale). The pressure the device exerted as well as the diameter of the device were measured and recorded.

The device is tested by placing the device between the scale and a custom-made arm that compresses the device at known, incremental distances, measured in mm. The device was measured first at its free state (i.e., for rabbit: 20 mm) and then slowly compressed in increments (i.e. 1 mm or 5 mm). The force that the device exerts on the scale at known compression increments was measured in grams. The pressure was calculated by converting the force measurement from grams to pounds-force. The pounds-force was then converted to PSI units by dividing the pound-force by the contact area of the device. The contact area of the device was defined as the working portion of the device. The PSI units were then converted into cm H₂O pressure. The resulting device diameter (mm) versus pressure (cm H₂O) was then graphed. FIG. 13 shows the diameter versus pressure curves for the rabbit and flower devices. 

We claim:
 1. An intravaginal urinary incontinence device comprising an anchoring portion and a working portion which is a stent comprising an elastic material and having a longitudinal axis and comprising at least three longitudinally extending struts, each of which is substantially parallel to the longitudinal axis, each of which at least partially extends in and at least partially defines either a first or a second generally parallel opposed face, wherein the first and second generally parallel opposed faces are separated by a space, and wherein the working portion has an insertion equivalent diameter measured as a maximum distance between the opposed faces ranging from about 10 to about 20 mm, and a use equivalent diameter measured as a maximum distance between the opposed faces that is greater than the insertion equivalent diameter and ranges from about 20 to about 35 mm under an expansion pressure of about 20 to about 150 cm H₂O, wherein a withdrawal element extends from the working portion, and wherein the working portion and anchoring portion are a uni-body construction.
 2. The device according to claim 1 wherein the elastic material comprises a shape memory polymer.
 3. The device according to claim 1 wherein the elastic material comprises a metal alloy.
 4. The device according to claim 3 wherein the metal alloy comprises a nickel-titanium alloy.
 5. The device according to claim 1 wherein the working portion has an initial equivalent diameter measured as a maximum distance between the opposed faces of about 30 mm and a length of about 25 mm, the insertion equivalent diameter measured as a maximum distance between the opposed faces is about 18 mm, and the use equivalent diameter measured as a maximum distance between the opposed faces is about 25 mm.
 6. The device according to claim 1 wherein the working portion is capable of exerting pressure of about 50 to about 250 cm H₂O at a use equivalent diameter measured as a maximum distance between the opposed faces of about 25 to 35 mm.
 7. The device according to claim 1 wherein the working portion is a wire form made in a sinusoidal pattern.
 8. The device according to claim 7 wherein the wire form is enclosed within a biocompatible material.
 9. The device according to claim 8 wherein the biocompatible material comprises silicone.
 10. The device according to claim 9 wherein the biocompatible material comprises a tubular silicone sheath.
 11. The device according to claim 9 wherein the biocompatible material comprises a silicone coating.
 12. The device according to claim 1 further comprising an anchoring portion having at least one member extending beyond an end of the working portion, opposite that from which the withdrawal element extends.
 13. The device according to claim 12 wherein the anchoring portion is designed and configured to engage lateral walls of the vagina.
 14. The device according to claim 13 wherein the anchoring portion comprises a wire form.
 15. The device according to claim 14 wherein the anchoring portion comprises at least two extensions beyond an end of the working portion.
 16. The device according to claim 14 wherein the wire form is enclosed within a biocompatible material.
 17. The device according to claim 16 wherein the biocompatible material comprises silicone.
 18. The device according to claim 17 wherein the biocompatible material comprises a tubular silicone sheath.
 19. The device according to claim 17 wherein the biocompatible material comprises a silicone coating.
 20. An intravaginal urinary incontinence device having an insertion end and a withdrawal end, said intravaginal urinary incontinence device comprising a substantially hollow working portion which is a stent comprising an elastic material and having a longitudinal axis and comprising at least three longitudinally extending struts, each of which is substantially parallel to the longitudinal axis, each of which at least partially extends in and at least partially defines either a first or a second opposed face, wherein the first and second generally parallel opposed faces are separated by a space, and the working portion has an insertion equivalent diameter measured as a maximum distance between the opposed faces ranging from about 10 to about 20 mm, and a use equivalent diameter measured as a maximum distance between the opposed faces that is greater than the insertion equivalent diameter and ranges from about 20 to about 35 mm under an expansion pressure of about 20 to about 150 cm H₂O, wherein the working portion is adjacent the withdrawal end.
 21. An intravaginal urinary incontinence device comprising a substantially hollow working portion which is a stent comprising an elastic material and having a longitudinal axis and comprising at least three longitudinally extending struts, each of which is substantially parallel to the longitudinal axis, each of which at least partially extends in and at least partially defines either a first or a second opposed face, wherein the first and second generally parallel opposed faces are separated by a space, and the working portion has an insertion equivalent diameter measured as a maximum distance between the opposed faces ranging from about 10 to about 20 mm, and a use equivalent diameter measured as a maximum distance between the opposed faces that is greater than the insertion equivalent diameter and ranges from about 20 to about 35 mm under an expansion pressure of about 20 to about 150 cm H₂O, wherein a withdrawal element is attached and extends from the at least two struts.
 22. An intravaginal urinary incontinence device comprising a substantially hollow working portion which is a stent comprising an elastic material and having a longitudinal axis and comprising at least three longitudinally extending struts, each of which is substantially parallel to the longitudinal axis, each of which at least partially extends in and at least partially defines either a first or a second generally parallel opposed face, wherein the first and second generally parallel opposed faces are separated by a space, and the working portion has an insertion equivalent diameter measured as a maximum distance between the opposed faces ranging from about 10 to about 20 mm, and a use equivalent diameter measured as a maximum distance between the opposed faces that is greater than the insertion equivalent diameter and ranges from about 20 to about 35 mm under an expansion pressure of about 20 to about 150 cm H₂O, wherein a withdrawal element extends from the working portion such that during removal of the device after use, the working portion has a smaller diameter than the use diameter. 